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TPS61023: TPS61023 and TPS61089 Start-up Waveform

Part Number: TPS61023
Other Parts Discussed in Thread: TPS61089

Figure1

               Vin=3.8V,Vout=4v,5 resistance load

Figure 2

Figure 1 is the start-up waveform of TPS61023 which I tested, and figure 2 is  the start-up waveform of the chip manual. There is a big difference after comparing the two. What is the reason?

Figure 3

                        Vin=4V,Vout=4v,12 resistance load

Figure 4

 Figure 3 is the start-up waveform of TPS61089 which I tested, and figure 4 is  the start-up waveform of the chip manual. There is a big difference after comparing the two. What is the reason?